// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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var common = require('./common');
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var assert = require('assert');
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var EventEmitter = require('../');
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var listener1 = function listener1() {};
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var listener2 = function listener2() {};
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{
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var ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('removeListener', common.mustCall(function(name, cb) {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener1);
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}));
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ee.removeListener('hello', listener1);
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var listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}
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{
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var ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('removeListener', common.mustNotCall());
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ee.removeListener('hello', listener2);
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var listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 1);
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assert.strictEqual(listeners[0], listener1);
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}
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{
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var ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('hello', listener2);
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var listeners;
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ee.once('removeListener', common.mustCall(function(name, cb) {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener1);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 1);
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assert.strictEqual(listeners[0], listener2);
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}));
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ee.removeListener('hello', listener1);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 1);
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assert.strictEqual(listeners[0], listener2);
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ee.once('removeListener', common.mustCall(function(name, cb) {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener2);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}));
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ee.removeListener('hello', listener2);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}
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{
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var ee = new EventEmitter();
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function remove1() {
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assert.fail('remove1 should not have been called');
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}
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function remove2() {
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assert.fail('remove2 should not have been called');
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}
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ee.on('removeListener', common.mustCall(function(name, cb) {
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if (cb !== remove1) return;
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this.removeListener('quux', remove2);
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this.emit('quux');
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}, 2));
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ee.on('quux', remove1);
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ee.on('quux', remove2);
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ee.removeListener('quux', remove1);
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}
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{
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var ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('hello', listener2);
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var listeners;
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ee.once('removeListener', common.mustCall(function(name, cb) {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener1);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 1);
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assert.strictEqual(listeners[0], listener2);
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ee.once('removeListener', common.mustCall(function(name, cb) {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener2);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}));
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ee.removeListener('hello', listener2);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}));
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ee.removeListener('hello', listener1);
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listeners = ee.listeners('hello');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}
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{
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var ee = new EventEmitter();
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var listener3 = common.mustCall(function() {
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ee.removeListener('hello', listener4);
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}, 2);
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var listener4 = common.mustCall();
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ee.on('hello', listener3);
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ee.on('hello', listener4);
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// listener4 will still be called although it is removed by listener 3.
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ee.emit('hello');
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// This is so because the interal listener array at time of emit
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// was [listener3,listener4]
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// Interal listener array [listener3]
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ee.emit('hello');
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}
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{
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var ee = new EventEmitter();
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ee.once('hello', listener1);
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ee.on('removeListener', common.mustCall(function(eventName, listener) {
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assert.strictEqual(eventName, 'hello');
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assert.strictEqual(listener, listener1);
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}));
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ee.emit('hello');
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}
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{
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var ee = new EventEmitter();
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assert.strictEqual(ee, ee.removeListener('foo', function() {}));
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}
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// Verify that the removed listener must be a function
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assert.throws(function() {
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var ee = new EventEmitter();
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ee.removeListener('foo', null);
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}, /^TypeError: The "listener" argument must be of type Function\. Received type object$/);
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{
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var ee = new EventEmitter();
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var listener = function() {};
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ee._events = undefined;
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var e = ee.removeListener('foo', listener);
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assert.strictEqual(e, ee);
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}
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{
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var ee = new EventEmitter();
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ee.on('foo', listener1);
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ee.on('foo', listener2);
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var listeners = ee.listeners('foo');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 2);
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assert.strictEqual(listeners[0], listener1);
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assert.strictEqual(listeners[1], listener2);
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ee.removeListener('foo', listener1);
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assert.strictEqual(ee._events.foo, listener2);
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ee.on('foo', listener1);
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listeners = ee.listeners('foo');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 2);
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assert.strictEqual(listeners[0], listener2);
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assert.strictEqual(listeners[1], listener1);
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ee.removeListener('foo', listener1);
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assert.strictEqual(ee._events.foo, listener2);
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}
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